Short answer: Xiaomi has acknowledged a list of HyperOS 4 bugs and says fixes will arrive in upcoming system and app updates. Among them: blurry rear-camera photos on the Xiaomi 17, telephoto autofocus failures on the Xiaomi 17 Ultra, white bars and broken icons on the Redmi K90 and Xiaomi 17T Pro, and app crashes on the Xiaomi 17 Pro and Pro Max. Some fixes are already rolling out, others are still being investigated.
The information comes from two Xiaomi sources: a bug-fix summary posted by a Xiaomi employee in the company’s community (reported by IT Home and Gizchina), and Xiaomi’s weekly HyperOS bug report (summarised by Cashify). Most entries concern Chinese builds, where HyperOS 4 has been stable since October 15. Global builds share most of the same code, so many fixes will reach them too.
Bugs Xiaomi says it is fixing
| Phone | Problem | Build affected |
|---|---|---|
| Xiaomi 17 | Rear camera photos sometimes blurry; global search menu glitch | 4.0.5.0 / 4.0.4.0 |
| Xiaomi 17 Pro | App store freezes, calculator history shown wrongly, browser crashes | 4.0.5.0 |
| Xiaomi 17 Pro Max | Automated tasks fail to start, Xiaomi Video landscape playback, global search and floating keyboard glitches, lost line breaks in Notes, WeChat freezes, Gallery crash while editing | 4.0.5.0 / 4.0.4.0 |
| Redmi K90 (POCO F8 Pro in global markets) | Xiaomi Mall app opens the wrong screen | 4.0.4.0 |
| Xiaomi 17 Ultra | Telephoto camera fails to focus | fixed in the weekly update |
| Redmi K90, Xiaomi 17T Pro | White bar at the screen edge, distorted app icons | fixed in the weekly update |
| Xiaomi 13 | Battery percentage shown inaccurately | fixed in the weekly update |
Xiaomi says the phones in the first list are examples. If other models have the same bugs, they’ll get the same fixes. Fixes for apps such as Gallery, Calculator or the browser can arrive as app updates, without a full system update.
Still under investigation
- Redmi K70: NFC contactless payments randomly stop working.
- Connection sharing between phones and tablets fails on some device pairs.
What to do if you hit one of these bugs
- Update apps first: open GetApps or the Play Store and install pending updates for Gallery, Camera, Calculator and the browser. Several fixes come this way.
- Report it: open the Services & Feedback app → Report a problem, and attach logs. Xiaomi uses these reports to choose which bugs to fix first.
- Check for a newer build: our HyperOS 4 tracker shows the newest build for each phone and region. If the update hasn’t reached you, you can install it manually.
- Last resort: going back to HyperOS 3 is possible, but it wipes the phone and needs an unlocked bootloader. See how to downgrade from HyperOS 4 to HyperOS 3.
FAQ
Is HyperOS 4 stable enough to install?
For most users, yes. The reported bugs are app-level problems on specific models, not boot or data-loss issues. If your phone is still offered only a Pilot build, waiting a few weeks for the stable build is the safer choice.
Will these fixes reach global (non-China) phones?
Fixes in shared code (camera, Gallery, search, keyboard, calculator) usually do. Fixes for China-only apps such as WeChat or Xiaomi Mall don’t matter for global builds.
How do I know which HyperOS 4 build I have?
Go to Settings → About phone, or paste the version into our version decoder to see the build, region and whether a newer one exists.
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